Uniden UH7750NB User manual

UH7740NB
UH7750NB
UHF CB Transceiver
For more exciting new products please visit our website:
Australia: www.uniden.com.au
New Zealand: www.uniden.co.nz

Introduction
Features 3
Preventive Maintenance 4
Troubleshooting 4
Controls / Connectors 5
Indicators 9
Included with Your UHF CB Transceiver 10
Optional Accessories 11
DIN-E Installation (UH7750 only) 12
Connecting the Microphone 14
Mounting the MIC Hanger 15
Operation
Turning on the Power 17
Setting the Volume 17
Setting the Manual Squelch 18
Setting the Auto Squelch 18
Monitor 19
Selecting a Channel 19
Programming the Instant Priority Channel 20
Recalling the Instant Channel 20
Transmitting 20
Call Function 20
Dual Watch 20
Using Repeater Channels 21
Operating the UHF CB Radio in Duplex Mode 22
Scanning 22
Open Scan (OS) Mode 23
Group Scan (GS) Mode 23
Priority Watch 24
Add/Remove Channels from SCAN Memory 24
50 RX Channels 25
Manual Programming 25
Deleting a programmed RX Channel frequency 25
Selecting the Call tone 26
Busy Channel Lockout 26
Roger Beep 27
Beep On/Off 27
CTCSS (Continuous Tone Coded Squelch System) 28
DCS (Digitally Coded Squelch) 28
Volume Sync 29
Backlight Colours 29
Backlight Brightness 30
LCD Contrast for Remote SPK/MIC 30
UHF CB Channel Guidelines 31
CTCSS & DCS Code List 34
Warranty 38
Contents
2
UNIDEN UH7740NB UH7750NB UHF CB Transceiver

The Uniden UH7740NB and UH7750NB is designed to provide you with years of
trouble free service. Its rugged components and materials are capable of withstanding
harsh environments. Please read this Operating Manual carefully to ensure you gain
the optimum performance of the unit.
NOTE
The citizen band radio service is licenced in Australia by ACMA
Radio-communications (Citizen Band Radio Stations) Class Licence
and in New Zealand by MED General User Licence for Citizen Band
Radio and operation is subject to conditions contained in those licenses.
Features
 
 
 
(450 - 520MHz in 12.5khz steps)
 †
 
 
(“off”, “01”, “02”, “03”)
 
 
 
 
 
 
 
 
 
and CH41 - CH48 per channel)
 
Watch
 
 
separately with Open Scan, Group
Scan
 
 
 
 
 
Coded Squelch System) and 104
additional DCS (Digital Coded Squelch)
codes that are user selectable
 
Push Switch
 
Microphone (Remote SPK/MIC) and
Extension Cable
 
increased mounting options
 
Squelch with optional Remote SPK/
MIC
 
information
 
 
acoustic waveguide design)
†AVS - Automatic Volume Stabilizer
detects and manages incoming
audio to comparable levels.
Introduction
3
UNIDEN UH7740NB UH7750NB UHF CB Transceiver

Preventive Maintenance
The following system checks should be made every six to twelve months:
 
 
 
 
Troubleshooting
Should the unit malfunction or perform poorly, follow these procedures:
If the transceiver is completely inoperative: Check the power cord and fuse.
If there is trouble with receiving: Check the VOLUME control setting. Be sure the
SQUELCH is adjusted properly. Possibly the radio is over-squelched.
If there is trouble with transmitting: Check that the transmission line (coaxial cable)
is securely connected to the ANTENNA connector. Check that the antenna is fully
extended for proper operation. Check that all transmission line (coaxial cable)
connections are secure and free of corrosion.
NOTE
Blackening may occur on the Liquid Crystal Display if the UHF CB
Radio or optional Remote SPK/MIC has been subjected to extreme high
temperature (above 60°C). This is not a fault. Normal LCD operation
resumes when the temperature stabilizes back to standard operating
condition (0-55°C).
Introduction
4
UNIDEN UH7740NB UH7750NB UHF CB Transceiver

UH7740NB Front View
UH7750NB Front View
Controls/Connectors
5
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
Controls and Connectors
1 Rotary CHANNEL Selector
2 MENU/ENTER - Menu and Select
Button
3 DUAL - Dual Watch
MON - Monitor Button
4 DCS/CTCSS - DCS and CTCSS
Tone Button
5 MEM - Memory Scan Channels
6 SCAN - Scan On/Off
OS/GS - Open or Group Scan
7 Liquid Crystal Display (LCD)
8 SQ - Rotary Squelch control
9 VOL - Rotary Volume control
ON/OFF - On/Off PUSH control
 
2 3 4 5 6 7
7
8
9
10
1
21 3 4 58 6 10 9

Controls/Connectors
6
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
UH7740NB Rear View
Connectors
 
12 UHF Antenna Connection
13 Power Input Connection (13.8VDC)
 
UH7750NB Rear View
1311 12 14
11 1312 14

Controls/Connectors
7
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
15
16
17 30
31
21
Standard Microphone
Controls and Connectors
15 CALL - Call Tone Button
16 INST - Instant Channel Button
17 PTT - Push To Talk Button
21 MICROPHONE
 
 

Controls/Connectors
8
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
Remote LCD Speaker Microphone (Remote SPK/MIC)
(Optional)
Controls and Connectors
15 CALL - Call Tone Button
16 INST - Instant Channel Button
17 PTT - Push To Talk Button
18 MENU/ENTER - Menu and Select Button
19 MEM - Memory Scan Channel
20 SCAN - Scan Button
OS/GS - Open Scan/Group Scan
21 MICROPHONE
22 SPEAKER
23 Liquid Crystal Display (LCD)
24 VOL - Volume Up Button
25 VOL - Volume Down Button
26 POWER - Power ON/OFF Button
27 SQL - Auto Squelch
MON - Monitor Button
28 DCS/CTCSS -- DCS & CTCSS Button
DUAL - Dual Watch Button
29 Select Up and Down Buttons
 
 
15
17
24
18
25
19
26
30
31
20 27
28
29
23
16
21
22

Indicators
9
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
UH7740NB and UH7750NB
Optional Remote MIC LCD
1
5
6
7
9
10
2
3
4
14
13
12
11
21
20
19 16
15
17
18
8
7414
17
2
11
10
20
18
22 16 9
8
6
12
5
3
Indicators
1. TX - Transmit
2. DUAL - Dual Watch
3. SCAN - Scan mode
4. Channel Frequency
5. GS - Group Scan
6. INST - Instant Channel
7. PRI - Priority Channel
8. M - Channel in Memory
9. Channel Number
10. DCS/CTCSS Code Number
11. S/RF- Receive Signal or Transmit
12. Signal Power Level
13. CTCSS -Continuous Tone
Coded Squelch System
14. BCL - Busy Channel Lockout
15. VSc - Volume Synch
16. DCS - Digital Coded Squelch
17. MON - Monitor
18. RSQ - Remote Mic Squelch
19. SQT - Tight Squelch Level
20. BUSY - Channel Active
21. DUP - Duplex Channel
22. CALL - Call Tone

Included with your UHF CB Transceiver
10
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
Standard Microphone UHF CB Transceiver
Owners Manual
Microphone Hanger
with Screws/Washers

Rubber Cover
Mounting Bracket,
Mounting Screws,
Washer Stars And Screws
(UH7740NB only)
Quick Release Bracket
(UH7740NB only)
Mounting Bracket,
Mounting Screws,
Washer Stars And Screws
(UH7750NB only)
DIN-E Sleeve, DIN-E rubber
ring and keys for vehicle
installation
(UH7750NB only)
DC Power Cord with fuse
UH7740NB
UH7750NB
UHF CB Transceiver
For more exciting new products please visit our website:
Australia: www.uniden.com.au
New Zealand: www.uniden.co.nz

Optional Accessories
11
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
DIN Mounting Kit (DMK770)
for compact models
Remote LCD Speaker
Microphone (RM770)
External Speaker

or MS100)
BTMIC KIT - Bluetooth MIC
(BM100) and Remote PTT with
Earpiece MIC
Extension cable kit for Remote
LCD Speaker Microphone

Rubber Cover

DIN-E Installation (UH7750NB only)
12
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
Mounting Using the DIN-E Sleeve
If you are unsure about how to install your UH7750NB in your vehicle using the DIN-E


all the necessary materials to complete the task. Your UH7750NB requires a 53 x 183 x
86 mm mounting area. Allow an additional 60 mm space behind the unit for connectors
and wires.
1. Remove the bracket if previously attached.
2. Install the DIN-E sleeve into the opening in your dashboard, lip facing out.
 
 
UH7750NB. Store the rubber ring in a safe place for future use.
5. Before inserting the UH7750NB in the sleeve, attach the cable from the previously
mounted antenna. Attach the DC Power leads. RED goes to a positive (+)
connection on your fuse block while BLACK connects to the vehicles chassis
ground (-). Be sure all the connections are routed away from any potentially
pinching or slicing sheet metal.
6. Slowly slide the UH7750NB into the sleeve until it locks in place.
NOTE

at a later time, expect to remove the unit for ease of making those
connections.

DIN-E Installation (UH7750NB only)
13
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
Removing the UH7750NB from the DIN-E Sleeve

you should plan to remove the UH7750NB from the DIN-E sleeve. This is easily done
using the provided Removal Keys.
Fully insert both Removal Keys straight into the slots on the left and the right edges of
the radio’s dress panel. You cannot remove the radio if only one key is available.
Press in fully and the radio will unlock from the sleeve making withdrawal from the
sleeve possible. Store the keys in a safe place for future use.

Connecting the Microphone
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UNIDEN UH7740NB UH7750NB UHF CB Transceiver
Front MIC Jack
Push the MIC plug at the end of the microphone into the MIC jack until the connection
locks into place. Gently tug the MIC cord to test that the connection is locked. Use the

from dust.
Disconnecting the MIC from the Front MIC Jack
Pull away the threaded rubber collar and move it down along the cord. Using

bottom (UH7750NB) or left (UH7740NB) side of the MIC plug and push it upwards
(UH7750NB) or to the right (UH7740NB). At the same time tug on the MIC cord to draw
back the MIC plug.
Rear MIC Jack

intrusive or if you wish to use the Remote LCD Speaker MIC with an optional extension
cable.
Peel the dust cover from the rear MIC jack. Push the MIC plug at the end of the
microphone into the MIC jack until the connection locks into place. An optional 2m
extension cable kit is available to enable mounting the main base in a hidden location.
NOTE

UH7740NB UH7750NB

Mounting the MIC Hanger
15
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
The Microphone Hanger comes in two parts. How and where you mount the MIC
hanger will determine which parts to use.
Conventional Mounting with Screws
Use the front part of the MIC Hanger only.
Locate a suitable mounting position and mark
and drill two 3mm holes.
Fix the MIC Hanger into place with screws.
Conventional Mounting with Double Sided Tape (not supplied)
High quality Double-Sided tape can be found at good retail stores.
Secure the front and back pieces of the MIC Hanger using the supplied binding screws.
Locate a suitable mounting position.



Mounting the MIC Hanger for Remote SPK/MIC
16
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
The plug of the extension cable connects to the Radio. The socket end of the extension
cable connects with the microphone plug.
1. The rubber collar (dust cover) on the microphone cable is not required
and can be cut away or pushed out of the way along the cable.
2. Drill a 13mm hole at the MIC hanger location.
3. Thread the microphone plug through the hole and connect with the
extension cable.
4. Mount the MIC Hanger over the hole and cable.
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Fit the rubber bushing over the front MIC jack.
Microphone 2
1
5
4
3
Microphone
Extension Cable
Radio
5

Operation
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UNIDEN UH7740NB UH7750NB UHF CB Transceiver
Turning on the Power
Press and hold the ON/OFF control at the
base or the [POWER] button on the Remote
SPK/MIC.
Setting the Volume
Turn the volume control at the base or press the volume on the side of the
optional Remote SPK/MIC to adjust the volume. The base volume is composed of 42
steps and the optional Remote SPK/MIC is 7 steps.
See Volume Sync on page 27 to synchronize the volume control when the optional
Remote SPK/MIC is connected.

Operation
18
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
Setting the Auto Squelch
The Auto Squelch feature is available only when the
optional Remote SPK/MIC is connected. It has an Off
setting and 3 preset squelch levels:
oFF - Auto Squelch OFF
1 - max sensitivity (min squelch)
2 - med sensitivity (med squelch)
3 - min sensitivity (max/tight squelch)
It requires no adjustment.
1. Press [SQL/MON] 
2. Rotate the channel knob at the base or press on the Remote SPK/MIC to
change the setting. RSQ icon displays when Auto Squelch is active. If tight squelch
 
3. Press [MENU/ENTER] to store the setting.
Think of the squelch control
as a gate. If you turn Squelch
fully clockwise it raises the
‘Squelch gate’ so high that no
signals get through.
Think of the squelch control
as a gate. If you turn Squelch
fully clockwise it raises the
‘Squelch gate’ so high that no
signals get through.
To set the ‘Squelch Gate’
to the desired level,
turn the squelch knob
counterclockwise until you
hear noise. Then carefully
turn the Squelch knob
clockwise until the noise
fades. Now only strong
signals get through.
Setting the Manual Squelch
Turn the outer ring of the SQ control at the base to adjust the Squelch.
NOTE
You must select a channel which is not in use before setting the
SQUELCH control. (see p.19 for “Selecting a Channel”).

Operation
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UNIDEN UH7740NB UH7750NB UHF CB Transceiver
Monitor
Press and hold [DUAL/MON] at the base or
[SQL/MON] on the Remote SPK/MIC to
open the squelch and receive all weak signals.
Press and hold [DUAL/MON] at the base or
[SQL/MON] on the Remote SPK/MIC again
to cancel.
Selecting a Channel
Turn the Rotary Channel Selector at the base
or press on the Remote SPK/MIC to
select the desired channel.
NOTE
For your reference a list of the available channels, corresponding
frequencies and guidelines for their use is printed on page 31. For
Australia, Channels 05 and 35 are reserved for Emergency Calls.

Operation
20
UNIDEN UH7740NB UH7750NB UHF CB Transceiver
Programming the Instant Priority Channel
Turn the Rotary Channel Selector at the base or press
on the Remote SPK/MIC to select the Priority Channel you
prefer.
Press and hold [INST] button on the microphone for 3
seconds to store the new setting. INST icon appears.
Recalling the Instant Channel
Momentarily press the [INST] button on the microphone at
any time to return to the Instant Channel.
Transmitting
The UHF CB Radio uses the UHF-CB Channels.
NOTE
For your reference a list of the available channels, corresponding
frequencies and guidelines for their use and selection is printed on p.31 -
p.33. For Australia, Channels 05 and 35 are reserved for Emergency Calls.
Select the desired channel. Press the microphone’s [PTT] button and speak normally
into the microphone. Hold it approx. 7cm from your mouth. Release the [PTT] button to
end the transmission and listen for a reply.
Call Function
Press the microphone [CALL] Button. A three second ringing tone
will be transmitted.
You may select from 5 types of tones (see p.26).
NOTE
Current regulations require calling tones to be restricted to one
transmission per minute. If a second transmission is attempted within
one minute then an error tone will sound.
DUAL Watch
Dual watch monitors the current channel and the Instant channel. (See Programming
the Instant Priority Channel above).
Press [DUAL/MON] on the base or press and hold [DCS/CTCSS/DUAL] on the
Remote SPK/MIC. DUAL icon appears and a short tone beep is heard.
To cancel DUAL Watch press [DUAL/MON] on the base or press and hold
[DCS/CTCSS/DUAL] on the Remote SPK/MIC. DUAL icon disappears.
PTT
CALL INST